No, sorry, we don’t support distribution of the raw APK at this time. This is the first time we ever had a request for it also, so it’s not very frequently requested. We may reconsider this in the future.
It’s also not possible to recompile the build because parts of the code is not open source. It uses the same core code as all the other versions, which is open source, but the UI-related Android/iOS-specific parts is proprietary.